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Editor: Online condition monitoring systems are widely used in the management of large-scale compression units and other equipment; they enable real-time monitoring of the operating status of these devices, providing reliable technical data for their maintenance, thereby **enhancing the intrinsic safety of equipment operation. I. Overview: The Gudao Branch of the Oil and Gas Transportation Company in the Shengli Oilfield is primarily responsible for transporting crude oil produced north of the Yellow River as well as supplying associated gas from this area. The 12SGT/SW64 natural gas compressor of Branch Company is a large-scale natural gas compression unit manufactured by Cooper Company in the United States, primarily used to boost the pressure of associated gas for external supply. This set of units came online in 1989 and has been in operation for 13 years so far. Since the original instrument monitoring system of the 12SGT/SW64 unit was a relatively outdated pneumatic type, some important operational parameters still had to be recorded by operators using the on-site primary instruments, and it was not possible to monitor temperatures such as those of the main shaft bearings of the engine and compressor. To this end, we carried out a digital upgrade of the unit’s instrument monitoring system, thereby further improving the level of automated control of the instruments to ensure normal production operations. II. System Composition: 1. Hardware configuration and principle of the FT-50/210 control communication system: The FT-50/210 control communication system consists of a field control system, hubs, a remote control system, and engineering terminals, among other components. Its basic working principle is as follows: The field instruments transmit signals to the digital input cards and analog input cards in the control cabinet; these signals pass through the input/output processor in the FT-50 main board, and the detected data is sent to the main processor via dual-port RAM. From there, it is transmitted to the FT210 control system through the communication system ； At the same time, the signals transmitted from the field are processed by the FT-50 main processor, which displays the field parameters as well as any faults that occur during operation, thereby enabling real-time monitoring of all operational parameters of the unit. 2. Software system: The Flextrend system is the storage and control system that runs the CBOS100 software; it includes one or more FT50/100 units, as well as one or more FT210 displays. Each FT50 consists of an I/O processor and a main processor. III. System Configuration 1. Control Configuration The control elements of the 12SGT/SW64 unit include: engine ignition ground switch, fuel gas valve, air-fuel ratio control, bypass valve control outputs, and governor control system, etc. In the governor control system, the electrical converters are calibrated and tuned primarily based on the operating conditions on site. The operations for other devices are designed using various logical elements in ladder logic diagrams. 2. Monitoring Configuration: The first step in monitoring configuration is to establish a real-time database. This is done after designing the control charts and ladder logic diagrams, by storing the relevant circuit points, signal points, alarm points, etc., in the real-time database. 3. Alarm configuration: Define each alarm point according to the process requirements, and set the upper and lower limits for these alarm points. At the same time, with the implementation of the online monitoring system, we have transmitted monitoring parameters such as the engine’s lubricating oil pressure to the duty monitoring room remotely ； At the same time, monitoring of the temperatures of the engine and compressor main bearings was added, **improving the intrinsic safety of equipment operation. 4. Historical trend configuration: Uses software to define and record and display historical trend data of important parameters such as the temperatures of the engine and compressor main shaft bearings. To observe the operational changes in data from key monitoring points. IV. Advantages of adopting this monitoring system: 1. With this monitoring system in place, it is possible to monitor the operating parameters of the units at any time via a computer, **which enhances the intrinsic safety of equipment operation. 2. After a malfunction occurs in the unit, historical curve graphs of the parameters at the fault point can be used to assess the operating condition of the equipment, **which reduces the time required to resolve equipment failures. 3. All parameters related to the operation of the equipment are read as digital signals, which improves the accuracy of reading these operational parameters.